| 摘要 |
PCT No. PCT/US94/02745 Sec. 371 Date Jun. 29, 1994 Sec. 102(e) Date Jun. 29, 1994 PCT Filed Mar. 14, 1994 PCT Pub. No. WO95/25327 PCT Pub. Date Sep. 21, 1995A first method for detecting movement of an actuator includes supplying a demand current to a voice coil motor of the actuator (A1), sampling a voice coil motor voltage (B1), performing a slope detection of a voice coil motor voltage function (C1) and extrapolating the voice coil motor function (D1) to identify a change in slope of the voice coil motor function. A second method for detecting movement of an actuator includes supplying a continuously increasing current ramp to the voice coil motor of an actuator (A2), measuring a back e.m.f. voltage of the voice coil motor (B2), performing a change in slope detection of a back e.m.f. voltage function (C2) and integrating the back e.m.f. voltage function (D2) to determine movement of the actuator.
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